Pneumatic conveyer for molding sand



July 6 1926.

C. C; HANSEN PNEUMATIC CONVEYER FOR MOLDING SAND Filed neo. a, 1925 25 uid onto atented July v6, l1926'.

UNITED STATES PATENT loFF-1cl3.

cHAnLEs. H/ANSEN, or EASTON, PENNSYLVANIA, AssIGNoR .To INGEasoLL-RANn coMrANY, E JERSEY CITY, lNEW JERSEY,v A coErRA'rIoN or NEW JERSEY;

PNEUMATIC coNvEYEn Eoa-MoLDINo SAND.

Application led December 8, 1925- Serilal No. 74,041.

This invention relates to pneumatic conveyers but more particularly tobe' used in foundries or constri ctlion work for pneumatically project-img,` sucn materials i. 5 as sand or cement. Sand or'cemen't not in suspension in liquid has heretofore been hard to project satisfactorily by pneumatic means as its lack of uniform viscosity or cohesion will not allow itfto be fedto the work 1 in even quantities but will rather cause' it to be fed in haphazard fashion which absolute-A vly prevents any accurate work by the operator.

My invention aims to overcome this diiiiculty by the use of a mechanical means for uniformly feedingmaterial into ,the path of 5 a compressed airstream adapted to blow it on the work. At thev same time I have .provided for the actuation of the entire de- 2oyiceby means of'compressed air so that its operation will be simple and economical.

The object of my invention therefore is to' provide a device for pneumatically feed ing sand or cement not in suspension in liqthe work desi/red in a predetermined quantity.. Another object of my invention is to 'provide a. portable device for feedingsuch material, the only motive power needed being a supply of compressedair,

while a further object of my invention is to provide a device for feeding such material in which the screening, mixing and projecting will be done automatically and at al speed predetermined by the operator. My invention ris embodied in the combination of ele- *ments and the features of novelty described in this specification, set forth in the appended claim and illustrated. in the drawing in which,

$0 The figure is a transverse sectional elevai tion of my invention showing its mode of use for the making of molds in foundry work.

. Referring o the drawing Ia hopper A is shown portabl -mounted on wheels B and having a restricted outlet C -at the vbottom through whichthe sand D is forced by means of gravity into the bottom of the chamber E. The chamber E is longitudinal in shape and extends along one side of the hopper A. A bucket chain conveyer F carrying the buckets G' is adapted to operate within the' a device tochamber E in such a way that the buckets will be drawn through the Vsand D at the bottom thereof and will carry the, sand up to the top of the chamber AE where they will drop the sand into a tapering nozzle H which in turn runs into a pneumaticv nozzle J so constructed that the sand will -be thrown into the path of a jet of compressed air K, and will then be blown through iexible'tubing Il and the projecting nozzle O which is adapted to be held by the operator. An air motor P of any preferred. design is used to 'operate'the bucket conveyer device F by means of the beltv Q and is suitably mountedupon the frame of the hopper. This same motor'is also adapted to be used-to motivate the screening device R, and the agitator'U, which 'is placed in the hopper A near the re'- stricted opening. A valve S is adapted to control the force of the air jet K Afor pro-l Ajecting the material upon the work. The operator is shown directing a supply of sand around the core T for the formation of a u mold. 4

In operation after the hopper A has been filled with sand, which has been screened by means of the automatic screening device R, the operator can start the bucket chain F moving at a predetermined speed'accordi'ng to the speed of the motor P and the sand will thereby be delivered in measured quantities into the chute H from which it will be blown also in a quantity predetermined by the eperator through manipulation of the valve upon the work T. v I am not to be understood as confining myself to -the invention as shown in the drawing, as such an invention lends itself to a multitudevof adaptations by one skilled v in the art, What I cl im as elements of novelty is the mechanica bucket chain conveyer which can be operated at any desired speed and which will thereby supply sand in *95 uniform quantities into the compressed air stream in combination with the nozzle K and pneumatic means for projecting thev sand upon the work through a iiexible tube.

A portable pneumatic conveyer for materials not in l suspension in a liquid compris' ing, a hopper, apneumatic motor mounted o n said hopper, a mechanical screen over said hopper motivated by the said motor, a mematerial from the restricted otiet and deohanical mixer at the bottom ofsaid hopper posit it in said chute, and pneumatic means motivated by said motor, a restricted outlet at the bottom of'said chute for projecting 10 in said hopper, a chamber at said restricted the saidmaterialg 5 Otlet, a chute leading from the top of said In testimony whereof have signed this chamber, a mechanical bucket conveyer mo- Specification. tivated by said motor adapted toseoop the y CHARLES C. HANSEN.A 

